title: Iron(III) tartrate as a potential precursor of light-induced oxidative degradation of white wine: studies in a model wine system.
abstract: The potential for iron(III) tartrate to act as a photoactivator in light-induced oxidative degradation of white wine is described. Using a tartaric-acid-based model wine system containing 5 mg/L iron, exposure to light from a xenon arc lamp led to the oxidative degradation of tartaric acid and the production of glyoxylic acid. The critical wavelength of light for the degradation process was found to be below 520 nm. No glyoxylic acid was formed in the absence of iron and/or light. Flint glass offered little protection from the light-induced photodegradation of tartaric acid. Antique Green glass offered more protection but did not stop the photodegradation process.
authors.affiliation: National Wine and Grape Industry Centre, School of Agricultural and Wine Sciences, Charles Sturt University, Wagga Wagga, New South Wales, Australia.
authors.forename: Andrew C
authors.initials: AC
authors.lastname: Clark
authors.forename: Daniel A
authors.initials: DA
authors.lastname: Dias
authors.forename: Trevor A
authors.initials: TA
authors.lastname: Smith
authors.forename: Kenneth P
authors.initials: KP
authors.lastname: Ghiggino
authors.forename: Geoffrey R
authors.initials: GR
authors.lastname: Scollary
mesh_terms: D002852:Chromatography, Ion Exchange; D005290:Ferric Compounds / Q000737:chemistry*; D006038:Glyoxylates / Q000737:chemistry; D008027:Light; D008956:Models, Chemical; D010084:Oxidation-Reduction; D013056:Spectrophotometry, Ultraviolet / Q000379:methods; D013644:Tartrates / Q000737:chemistry*; D014920:Wine
chemical_list: D005290:Ferric Compounds; D006038:Glyoxylates; D013644:Tartrates; C031150:glyoxylic acid